Rechargeable electric fuse.



A. J. ORELLI. REGHARGEABLE ELECTRIC FUSE. APPLIGATION FILED FEB. 21, 1910.

961,891 Patented June 21, 1910.

STATES PATENT OFFICE.

AGOSTINE J'. ORELLI, 0F LONGBEACH, CALIFORNIA.

RECHARGEABLE ELECTRIC FUSE.

Spe'oicationpof Letters Patent. Patented J 'une 21, 1910, Applicationled February 21, 1910. Serial lo. 545,219. i

To all wlwmit ma/y concern:

Be it known that I, Aoos'riNn J. ORELLI,

a citizen of the United States, residing at y vide a rechargeable fuse in which the parts will be held ti htly in position when in use. A further o ject of the invention is to provide a char fuse in which the contact will be maintained in eiiicient condition during the operation of the fuse.

Other ob'ects and advantages of the invention wil appear hereinafter.

Referrin to the drawings; Figure 1 is a longitudina section of the fuse. Fig. 2, is a erspective showing the parts in separatedp relation. Fig. 3 is a vertical section of the connector portion of the fuse, taken on the line :v3- in Fig. 1.

The fuse comprises a fuse strip 1, of fusible material, provided with terminal means 2 and a case for inclosin and supporting said strip, and provided with means for engaging said terminal means to conduct the current thereto. Said case coin rises a tubular or cylindrical shall 3 o insulating material having metal ferrules 4 fastened on the respective ends thereof, said ferrules,

for example, being crimped or pressed over the ends of the shell 3,as shown at 4', so as to be held frictionally and tightly thereon, and said ferrules being provided with screw threaded portions 5 on which screw closure caps 6 at the respective ends of the shell to inclose the fuse. End lates or disks 8 are provided at each endo theshell resting on the end ferrules 4 and lsipportin the terminals-2 of the strip 1. ach dis 8 has a radial cut or slot 9 to receive the longitudinal portions 2 of the terminal means 2, said lon 'tudinal portions `preferably consisting o s ring metal strips soldered to the strip 1 an extending longitudinally therefrom with their ends bent over in bow or curved shape, as shown at 10, to form the contact means.

The device is assembled as follows A fuse lmember 1, 2 is placed within the shell 3 and the slotted disks 8 are placed at the respective ends of said shell, being slipped over the longitudinal ortions 2 of the terminals 2, said longitu inal ortions extending in the slots 9 of said dis s, and the bow spring portions 10 of the terminals 2 extending over the outside of said disks. The interior of the shell may be lled with any suitable insulating refractory filling 12 in the usual manner. The end caps 6 are then screwed Aonto the ferrules 4, and said caps engaging with the bow spring portions 10 of the terminals 2 serve to make spring-oontact to said terminals.

By reason of the elastic nature of this contact I am enabled to maintain eiicient electric connection for adeinite period notwithstanding the expansions and contractions due to changes of temperaturein the operation ofthe device, this being a material advantage over the use of the ordinary fiat connectors wherein the cap screws down tightly onto itat connectingv` strips. The above described construction also does away with the'use of fastening pins such-as have been `employed for fastening the ferrules to the shell, such ins bein necessarily removable and there ore invo ving an'element of looseness and liability to derangement of the parts. p Fuse strips of this character are generally standardized by slotting or notching one edge of the strip so as to reduce the cross section at that point, thereby -limiting the ca acity of the fuse. In punc ing or cutting this slot or notch there is liability of slight variation in the depth of the cut with corresponding variation in the capacity. To obviate such variation, I prefer to provide a strip with one or more perforations, indicated at 13, with metal extendin between the erforations and each edge o the strip' ydisk being slotted, a fuse strip provided with longitudinally extending terminal strips at `each end thereof, said terminal strips extending within the slots of said disks and being bent over at the ends, and terminal caps screwing on the end ferrules aforesaid and bearing on the bent over portions of said terminal strips of said fuse strip to make contact therewith.

2. A rechar eable electric fuse comprising a shell of insuating material provided with a metallic ferrule at each end, a disk resting on said ferrule at each end of the shell, said disk being radially slotted, a fuse strip provided with longitudinally extending terminal strips at each end thereof, said terminal strips extending within the slots of said disks and being bent over at the ends, and terminal caps screwing on the end ferrules aforesaid and bearing on the bent over portions of said terminal strips of said fuse y strip to make contact therewith, said bent over portions of the terminal strips being bowed and being of elastic material to provide spring contact.

3. A rechargeable electric fuse comprising a shell of insulating material provided with a metallic ferrule at each end, a pair of disks resting on said ferrule at each end of the shell, said disks being radially slotted with the slots in the two disks extending in opposite direction, a fuse strip provided with longitudinally extending terminal strips at each end thereof, said terminal strips ex'- tendin within the slots of said disks and being ent over at the ends, and terminal caps screwing on the end ferrules aforesaid and bearing on the bent over portions of said terminal strips of said fuse strip to make contact therewith.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 11th day of February, 1910.

AGOSTINE J. oRELLI.

In presence of ARTHUR P. KNIGHT, FRANK L. A. GRAHAM. 

